<div class="row">
  <div class="col-lg-4" *ngFor="let s of sl" >
      <img class="rounded-circle" src="{{s.img}}" alt="Generic placeholder image" width="140" height="140">
      <h2>{{s.title}}</h2>
      <p>{{s.summary}}</p>
      <p><a class="btn btn-secondary" href="#" role="button">查看详细 &raquo;</a></p>
    </div><!-- /.col-lg-4 -->
</div>
